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# Density

## on Jan 14, 2012

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## DensityPresentation Transcript

•  Density is defined as the mass in a unit of volume.
•  In the SI unit system, mass is measured in kg and volume is measured in m3, thus, the unit of density is kg/m3 (kilogram per cubic meter). But this is inconvenient for most substances, therefore, g/cm3 (gram per cubic centimeter) is a more common unit of density.
•  Densityis a characteristic property of matter. We can differentiate substances by using their densities. View slide
• How tomanipulate theformula View slide
• In order to calculate the density of an object,first we measure its mass with a scale, thenwe find its volume by measuring it with aruler, if it has a regular shape. Otherwise weuse the graduated cylinder method forirregular objects, and liquids. Then, bydividing mass by volume, we find the densityof the object.
• What is the volume of 24 tons ofcement? (dcement = 3000 kg/m3)Calculate the mass of copperhaving the same volume as 31,5 gof silver. Use Table 1.7.
• A bottle has a mass of 70 g when itis empty, 90 g when it is full ofwater and 96 g when it is full of aliquid. What is the density of theliquid in g/cm3 and kg/m3 ?
• Calculate the mass of air (at 0° C)in a room having dimensions of 3m, 6 m, 5 m. See Table 1.7.
•  The density of a mixture is found by dividing the total mass of the mixture by its total volume.
• 1.3 kg of a liquid and 2 kg ofwater are mixed in a container.Find the density of the mixture.Take dliquid = 1.3 g/cm3 and dwater= 1 g/cm3.
• Two different substances ofvolumes 200 cm3 and 300 cm3 aremixed to make an alloy. If theirdensities are 1.2 g/cm3 and 1.6g/cm3 respectively, find thedensity of the alloy.
• One complete rotation of eartharound its axis is called one day. Itis equal to 24 hours (h), 1 hour is60 minutes (min) and 1 minute is60 seconds (s). The unit of time isthe second. A stopwatch or clockis used to measure time.
• What is the equivalent of one weekin terms of hours, minutes andseconds?